EP2342317B1 - Hanging drop plate - Google Patents
Hanging drop plate Download PDFInfo
- Publication number
- EP2342317B1 EP2342317B1 EP08800437A EP08800437A EP2342317B1 EP 2342317 B1 EP2342317 B1 EP 2342317B1 EP 08800437 A EP08800437 A EP 08800437A EP 08800437 A EP08800437 A EP 08800437A EP 2342317 B1 EP2342317 B1 EP 2342317B1
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- EP
- European Patent Office
- Prior art keywords
- hanging drop
- conduit
- drop plate
- plate
- cells
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L3/00—Containers or dishes for laboratory use, e.g. laboratory glassware; Droppers
- B01L3/50—Containers for the purpose of retaining a material to be analysed, e.g. test tubes
- B01L3/508—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above
- B01L3/5085—Containers for the purpose of retaining a material to be analysed, e.g. test tubes rigid containers not provided for above for multiple samples, e.g. microtitration plates
-
- C—CHEMISTRY; METALLURGY
- C12—BIOCHEMISTRY; BEER; SPIRITS; WINE; VINEGAR; MICROBIOLOGY; ENZYMOLOGY; MUTATION OR GENETIC ENGINEERING
- C12M—APPARATUS FOR ENZYMOLOGY OR MICROBIOLOGY; APPARATUS FOR CULTURING MICROORGANISMS FOR PRODUCING BIOMASS, FOR GROWING CELLS OR FOR OBTAINING FERMENTATION OR METABOLIC PRODUCTS, i.e. BIOREACTORS OR FERMENTERS
- C12M25/00—Means for supporting, enclosing or fixing the microorganisms, e.g. immunocoatings
- C12M25/01—Drops
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0809—Geometry, shape and general structure rectangular shaped
- B01L2300/0829—Multi-well plates; Microtitration plates
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L2300/00—Additional constructional details
- B01L2300/08—Geometry, shape and general structure
- B01L2300/0848—Specific forms of parts of containers
- B01L2300/0858—Side walls
Definitions
- the present invention relates to a hanging drop plate.
- This hanging drop plate comprises a body with a first surface and a second surface that is essentially coplanar to the first surface.
- the second surface comprises at least one drop contact area for adherently receiving a liquid volume.
- cells may be cultivated or molecular aggregates may be produced.
- This drop contact area is distinguished from a surrounding area by a relief structure or a selective hydrophobic coating that prevents spreading of the liquid volume on the second surface of the hanging drop plate body.
- the hanging drop (HD-) technology has shown to be a universal method to enable 3D cell culture with neoplastic as well as primary cells (see Kelm and Fussenegger, 2004, Trends in Biotechnology Vol. 22, No. 4: 195-202 ). Drops of cell culture medium with suspended cells are placed onto a cell culture surface and the plate is inverted. As there is no substrate available on which the cells can adhere, they accumulate at the bottom of the drop and form a microtissue.
- Cultivation of cells in drops that are hanging at a surface is well known to the person of skill in the art.
- Form DE 103 62 002 B4 for example, the usual way of depositing drops of a cell suspension in a nutrient medium with a pipette on the inner surface of a Petri dish cover is known.
- the Petri dish cover then has to be inverted and placed on an appropriate Petri dish base plate. In the so closed Petri dish, the drops hang from the cover surface.
- the Petri dish often contains wet filter paper for providing the hanging drops with a humid atmosphere that prevents the hanging drops from drying.
- One of the most critical steps of this conventional hanging drop technique is inverting the plate to which the drops are attached; thus, this crucial step very often has to be carried out manually by an experienced scientist.
- the drops applied with a pipette may comprise only a small volume as the drops may move on the surface during inverting the surface for providing the correct position to establish hanging drops.
- sharp-edged relief structures that limit a drop contact area on a particular surface are proposed.
- WO 2008/123741 A1 discloses a cell culture dish for embryoid body formation from embryonic stem cells in grooves at the lower ends of support rods attached to the bottom of a cover lid to be placed over a culture dish.
- the arrangement is intended for hanging drops which, however, have to be applied from below to the lower ends of the support rods.
- US 2003/0235519 A1 discloses a lid covering the wells in a microplate and intended for applying hanging drops to the bottom side of the lid.
- the arrangement allows loading the liquid from above via some kind of microfluidic channels incorporated in the lid.
- such channels are not precisely defined and thus do not allow accurate control of the liquid loading step.
- This hanging drop plate as introduced at the beginning and according to the present invention is characterized in that the body further comprises at least one conduit that mouths into the at least one drop contact area from the direction of the first surface of the body the conduit comprising a culture compartment that is situated close to the second surface of the body and that comprises at least a part of the drop contact area. Additional inventive and preferred features derive from the dependent claims.
- the conduit partly penetrates the body in an essentially perpendicular direction in the region of the at least one drop contact area and partly extends essentially parallel to the second surface.
- the conduit comprises an inlet connection that is situated at a side front of the body.
- the conduit in addition penetrates the first surface of the body in an essentially perpendicular direction.
- the drop contact area is selectively coated with a hydrophilic coating. In another embodiment, the drop contact area is selectively coated with biologically active compounds, which are selected from a group comprising polypeptides and polynucleotides.
- the surrounding area is selectively coated with a hydrophobic coating.
- the hanging drop plate essentially has the shape of a standard microplate and the drop contact areas are arranged in an array, preferably of 4 x 6, of 8 x 12, or of 16 x 24 drop contact areas.
- a set for cultivating cells or for producing molecular aggregates comprises one hanging drop plate and two cover plates that are accomplished to be used as a bottom and/or top cover plate.
- a number of cells or cellular micro-aggregates of at least one cell type are:
- a method of cultivating cells or of producing molecular aggregates wherein a part of the liquid in the liquid volume is withdrawn through the respective conduit of the hanging drop plate that is dedicated to the drop contact area.
- the hanging drop plate according to the present invention is useful in the screening of drug system, in cell-based toxicity testing, and in mass production of cellular re-aggregates or protein crystals.
- the at least one drop contact area 5 is distinguished from a surrounding area 7 by a relief structure 8 that prevents spreading of the liquid volume 6 on the second surface 4 of the body 2.
- the body 2 further comprises at least one conduit 9 that mouths into the at least one drop contact area 5 from the direction of the first surface 3 of the body 2.
- the relief structure 8 in this case is accomplished as a circular rim and the conduit 9 penetrates the entire body 2 in an essentially perpendicular direction from the first surface 3 to the second surface 4.
- the conduit 9 comprises an inlet compartment 12 that is situated close to the first surface 3 of the body 2.
- the inlet compartment 12 is accomplished as a widened portion 13 of the conduit 9 inside of the body 2, which is accomplished as one integral element.
- the conduit 9 comprises a culture compartment 17 that is situated close to the second surface 3 of the body 2 and that comprises at least a part of the drop contact area 5.
- the culture compartment 17 is accomplished as a funnel-shaped depression with straight walls.
- Figure 2 shows a front and top view as well as a 3D representation of a unit cell of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to a second embodiment.
- the culture compartment 17 is accomplished as a funnel-shaped depression with curved walls.
- the conduit 9 comprises a capillary portion 18 with a diameter of at least 10 ⁇ m, preferably between 10 ⁇ m and 500 ⁇ m, most preferably between 50 ⁇ m and 200 ⁇ m.
- the cylindrical capillary portion 18 of the conduit 9 has a length of 0 mm here and the conduit 9 again is accomplished as an un-branched channel that essentially extends perpendicularly to the first and second surfaces 3,4, and all portions of the conduit 9 being coaxially aligned. Deviating from the presentation in Figure 2 , the length of the cylindrical capillary portion 18 of the conduit 9 could be up to 30 mm as well.
- Figure 4 shows two front views and a top view as well as a 3D representation of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment.
- Preferred dimensions are indicated and are very close to the dimensions of a standard microplate.
- a two dimensional array of 384 drop contact areas 5 and conduits 9 is depicted here.
- the axial distances thus preferably are 4.5 mm in order to meet the ANSI/SBS standard and to be able to incorporate the array of 384 drop contact areas 5 and conduits 9 in a hanging drop plate 1 with the dimensions that are at least approximately the dimensions of a standard microplate.
- the array of these unit cells preferably is surrounded by a horizontal plate 24.
- the horizontal plate 24 itself preferably is surrounded by a vertical rim 25 that exhibits a lower web 26 and an upper depression 27.
- the web 26 and the depression 27 are of such dimensions that they serve as stacking means for tightly stacking the hanging drop plates 1 and for safely holding the stacked plates in place.
- the height of the web 26 and the depression 27 preferably is about 2 mm in each case.
- the position of the web 26 and the depression 27 could be interchanged without losing their function as stacking means.
- the dimensions of the horizontal plate 24 and the vertical rim 25 could be changed without departing from the spirit of the present invention.
- the vertical rim 25 protrudes over the first surface 3 and below the second surface 4 of the hanging drop plate 1.
- the vertical rim 25 also protrudes below the relief structure 8 on the second surface 4 of the hanging drop plate 1.
- Such a protruding vertical rim 25 additionally secures the first and second surfaces 3,4 of the hanging drop plate 1 from being damaged or touched. Also the danger of contamination of these two surfaces is greatly reduced by the vertical rim 25.
- Figure 5 shows a front and a side view of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment in combination with a top and bottom cover plate.
- a two dimensional array of 384 drop contact areas 5 and conduits 9 is depicted here.
- the array of these unit cells preferably is surrounded by a horizontal plate 24, which preferably is surrounded by a vertical rim 25 that exhibits a lower web 26 and an upper depression 27.
- the web 26 and the depression 27 are of such dimensions that they serve as stacking means for tightly stacking the hanging drop plates 1 and for safely holding the stacked plates in place.
- cover plate 22 also exhibits a lower web 26 and an upper depression 27 that correspond with those of the hanging drop plate 1.
- a cover plate 22 that is accomplished to be used as a bottom and/or top cover plate as the case may be. This has the advantage that the same cover plate 22 can be used as shell underneath the hanging drop plate 1 or as a cap on top of it.
- a cover plate 22 is placed as a bottom shell plate. This first hanging drop plate 1 can be covered by a second cover plate 22 that is now used as a cap.
- Such a “sandwich” of two cover plates 22 and one hanging drop plate 1 between them is the smallest unit preferably formed for storage, cultivation or incubation, and safe transport of a hanging drop plate, whether it is loaded with liquid volumes and cells and/or molecules or not (see Fig. 5 ).
- hanging drop plates 1 can directly be stacked on top of each other and only covered on the top and the bottom of the uppermost and lowermost hanging drop plate 1 with a cover plate 22. This is especially preferred when all hanging drop plates of a stack are loaded with the same samples so that no cross contamination is to be feared at all. If however different samples are loaded (within the same or different hanging drop plates 1 of a stack), it is preferred to separate the hanging drop plates 1 with an intermediately placed cover plate 22 between each of the hanging drop plates 1.
- the most preferred set for cultivating cells or for producing molecular aggregates preferably comprises one hanging drop plate 1 and two cover plates 22.
- Figure 7 shows a photographic image of a culture medium drop, hanging at the drop contact area 5 of the hanging drop plate 1 with a conduit 9 that exhibits a hyperboloid shape, according to the second embodiment. It is evident that the conduit 9 essentially is filled with culture medium. This holding the drop (i.e. the liquid volume 6) at the drop contact area 5 is due to a combined action of different elements:
- the image has been taken from a prototype of a linear array of unit cells of a hanging drop plate 1 with a conduit 9 that exhibits a hyperboloid shape, according to a second embodiment (see Figures 2 and 3 ).
- the prototype In order to place the prototype in a Petri dish that was used as a bottom shell, the prototype had been equipped with a horizontal plate 24, a vertical rim 25, and a stand plate 28 that all surround the unit cells of the hanging drop plate 1.
- a practically closed space was formed, which allowed a saturated humid atmosphere to be kept around the liquid volumes 6 situated at the respective drop contact areas 5.
- Figure 8 shows a schematic cross section of the photographic image in Figure 7 .
- the same reference numbers direct to the same or similar features, even if they are not discussed in detail in each case.
- Figure 9 shows alternative variants of the first and second embodiment of the hanging drop plate.
- the layout of the hanging drop plate 1 is according to the prototype shown in the Figures 7 and 8 .
- single unit cells or entire hanging drop plates 1 with the approximate shape and dimension of a standard microplate could also show unit cells according to the variants shown here.
- Figure 9A shows two alternative relief structures 8 that prevent spreading of the liquid volume 6 on the second surface 4 of the body 2 of the hanging drop plate 1 according to the invention.
- the relief structure 8 (instead of being a rim) may be accomplished as ring-like depression (see left side) or as ring-like elevation (see right side). In any case, an abrupt change of direction in the profile of the relief structure 8 is safely defining the border of the liquid volume 6 or the drop.
- Figure 9B shows two different surface treatments that prevent spreading of the liquid volume 6 on the second surface 4 of the body 2 of the hanging drop plate 1 according to the invention.
- the drop contact area 5 is selectively coated with biologically active compounds, which are selected from a group comprising polypeptides (antibodies, growth factors, enzymes) and polynucleotides (RNA, DNA single or double strands).
- biologically active compounds which are selected from a group comprising polypeptides (antibodies, growth factors, enzymes) and polynucleotides (RNA, DNA single or double strands).
- RNA DNA single or double strands
- the surrounding area 7 is selectively coated with a hydrophobic coating 21.
- a combination of these two treatments is especially preferred as well.
- the utilization of a hydrophobic coating 21 may even dispense with the necessity to incorporate a relief structure in the form of an additional rim or depression at the second surface 4.
- the edge 29 shown here is sufficient as a relief structure 8.
- Figure 9C shows two alternative relief structures that additionally provide minimizing or maximizing the drop volume.
- a depression with an edge 29 is formed on the left side.
- the drop volume is maximized.
- an elevation with an edge 29 is formed; thus, minimizing the drop volume.
- a hanging drop plate 1 is shown here, the conduit 9 of which comprises an inlet compartment 12 that is situated close to the first surface 3 of the body 2.
- the inlet compartment 12 is accomplished as a widened portion 13 of the conduit 9 inside of the body 2 (see e.g. Figs. 9A and 9B ) or as a cup 14 on the first surface 3 of the body 2 as depicted here.
- a combination of such a widened portion 13 and a cup 14 is also feasible (not shown).
- Figure 10 shows schematic cross sections of hanging drop plates 1 that have a body 2, which comprises an upper part 15 and a lower part 16 that are attached to one another.
- This two-part arrangement greatly facilitates the production of an alternative hanging drop plate 1 with a conduit 9 that partly penetrates the body 2 in an essentially perpendicular direction in the region of the at least one drop contact area 5 and that partly extends essentially parallel to the second surface 4 of the hanging drop plate 1.
- Figure 10A shows a variant with a side inlet to fix a liquid line to the conduit.
- the conduit 9 comprises an inlet connection 10 that is situated at a side front 11 of the body 2.
- lines 30 can directly be connected to a hanging drop plate 1. Through such lines 30, liquids as well as cells or molecules can be delivered at any time to the liquid volumes 6 of a hanging drop plate 1. Thus, exchange of liquids, such as buffers or washing liquids in the liquid volumes 6 is facilitated.
- Figure 10B shows a variant with an open top inlet compartment that is fluidly connected to two or more conduits for supplying a 384 drop array with liquid dispensed from a 96 tip dispenser head.
- the conduit 9 in addition penetrates the first surface 3 of the body 2 in an essentially perpendicular direction and the conduit 9 is accomplished as a branched channel comprising channel parts 19 that essentially extend perpendicularly to the first and second surfaces 3,4 and branch parts 20 that essentially extend parallel to the second surface 4.
- the drop contact areas 5 can be spaced apart by an axial distance 23 of 4.5 mm
- the open top inlet compartments 12 then preferably are spaced apart by 9 mm or the double axial distance 23.
- a linear array hanging drop plate 1 (compare to Fig.
- two branch parts 20 join a common channel part 19.
- a 2D-array hanging drop plate 1 (compare to Fig. 4 )
- four branch parts 20 join a common channel part 19.
- Complementary control of the drop shape and position can be obtained by selective coating of the inside surface of the culture compartment 17, the ridge 8 and the surrounding plate 7 to achieve hydrophilic and hydrophobic areas.
- the inside surfaces of both compartments 12,17 and the conduit 9 can be coated with a surface film that prevents cells from adhering to the surface.
- the surface can be patterned directly using micro- and nano-machining techniques to prevent adhesion.
- the hanging drop plates 1 are preferably tissue culture plates of standard outer dimensions (ANSI/SBS 1-2004) compatible with high throughput systems. As shown, the hanging drop plate 1 set preferably consists of two elements:
- Both elements are made out of or at least comprise at their respective surfaces a biocompatible plastic material (e.g. Polycarbonate, Polyethylene, Polystyrene, or Polypropylene). Both elements (hanging drop plate 1, cover 22) are compatible with photometric readers (reading from the top and bottom, preferably bottom reading).
- the hanging drop plate 1 contains preferably 96 or 384 units of the hanging drop wells.
- the hanging drop plate 1 preferably is equipped with a vertical rim 25 for cover-independent robotic handling.
- the cover 22 provides enough space for drop formation within each single unit of the hanging drop plate 1.
- Hanging drop plates 1 are designed to be stacked onto each other.
- Covers 22 can be equipped with a narrow channel system or trough along the inner side of the base allowing to be filled with water/saline in order to minimize drop evaporation. Covers 22 can be used for both, lower and upper shells of hanging drop plates 1 to minimize evaporation and protect from contaminations.
- the present invention provides a device for coaxing and culturing of cells into the third dimension without artificial substrate-cell interactions.
- the device comprises a microfluidic system with two compartments (inlet compartment 12 and culture compartment 17).
- the volume of the inlet compartment 12 is preferably between 5 ⁇ l and 50 ⁇ l, most preferably between 10 ⁇ l and 30 ⁇ l.
- the volume of the culture compartment 17 is preferably between 10 ⁇ l and 100 ⁇ l, most preferably between 10 ⁇ l and 50 ⁇ l.
- the shapes of inlet compartment 12 and culture compartment 17 can be cylindrical, conical or hyperbolical.
- Each culture volume of a single unit preferably connects to a ring 8 which protrudes from the culture compartment bottom to stabilize and separate individual drops.
- the height of the drop separator ring or relief structure 8 in the form of a ridge is preferably between 0.1 mm and 5 mm, most preferably between 1 and 2 mm.
- a typical protocol for the production of a hanging drop culture is as follows:
- Freshly isolated cardiomyocytes from neonatal rats were produced according to the above protocol not including cell harvesting from 2D cultures (point a from the protocol).
- the resulting microtissues produced from 10'000 cells/drop correspond to a microtissue size of about 250 ⁇ m in diameter. This is demonstrated in Figure 11 that shows a microscopic image of rat cardiomyoyte-composed microtissues produced with a hanging drop plate according to Fig. 7 .
- FIG. 12 shows microscopic images of human hepatoma microtissues 48 hours after seeding with 100 cells per drop ( Fig. 12A ) and 250 cells per drop ( Fig. 12B ). These cell densities resulted in microtissues of 100 ⁇ m and 200 ⁇ m in diameter respectively.
- Rat pancreatic islet cells (250 cells per drop) were treated according to the above protocol as it is demonstrated in the Figure 13 that shows microscopic images of rat pancreatic islet cells at different time points after seeding.
- the formation of the rat pancreatic islet microtissue can be followed: After 3 hours of incubation, practically only single cells are present (see Fig. 13A ). After 24 hours of incubation, practically all cells have aggregated (see Fig. 13B ). After 96 hours of incubation, a spherical rat pancreatic islet microtissue with a diameter of approximately 100 ⁇ m has been formed (see Fig. 13C ).
- the present invention comprises a method of cultivating cells or of producing molecular aggregates in at least one liquid volume 6 that adheres to a drop contact area 5 of a hanging drop plate 1 as described on the base of the Figures 1 to 10 .
- the hanging drop plate 1 comprises a body 2 with a first surface 3 and a second surface 4 that is essentially coplanar to the first surface 3 and that comprises at least one drop contact area 5 for adherently receiving the at least one liquid volume 6 therein.
- the at least one drop contact area 5 is distinguished from a surrounding area 7 by a relief structure 8 that prevents spreading of the liquid volume 6 on the second surface 4 of the body 2.
- the method according to the present invention is characterized in that a liquid volume 6 is applied to a drop contact area 5 through a conduit 9 that mouths into the drop contact area 5 from the direction of the first surface 3 of the body 2.
- a number of cells or cellular micro-aggregates of at least one cell type are preferably, a number of cells or cellular micro-aggregates of at least one cell type.
- a number of cells or cellular micro-aggregates of at least one cell type are
- a part of the liquid in the liquid volume 6 is withdrawn through the respective conduit 9 of the hanging drop plate 1 that is dedicated to the drop contact area 5.
Description
- According to generic portion of the
independent claim 1, the present invention relates to a hanging drop plate. This hanging drop plate comprises a body with a first surface and a second surface that is essentially coplanar to the first surface. The second surface comprises at least one drop contact area for adherently receiving a liquid volume. In this liquid volume, cells may be cultivated or molecular aggregates may be produced. This drop contact area is distinguished from a surrounding area by a relief structure or a selective hydrophobic coating that prevents spreading of the liquid volume on the second surface of the hanging drop plate body. - It is generally accepted that cells cultured in a 3D configuration are physiological more relevant than cells in classical monolayer cultures (see e.g. Yamada and Cukiermann, Cell, 2007; Pamploni et al. Nature Reviews Molecular Cell Biology, 2007). Coaxing cells into the third dimension is the quintessential design problem. Current technologies are mostly based either on the use of scaffold materials or stacking of monolayers to shape the cells. However, despite the biological benefit, current state-of-the-art technologies are not laboratory routine or used on an industrial scale for applications such as drug discovery or toxicity assays given that the cell culture process is more complex, time-consuming and requires additional biomaterials. The re-aggregation of cells is an alternative approach to coax cells into the third dimension. But current re-aggregation technologies have been proven mostly with neoplastic cell lines and lack controlled co-culture possibilities. The hanging drop (HD-) technology has shown to be a universal method to enable 3D cell culture with neoplastic as well as primary cells (see Kelm and Fussenegger, 2004, Trends in Biotechnology Vol. 22, No. 4: 195-202). Drops of cell culture medium with suspended cells are placed onto a cell culture surface and the plate is inverted. As there is no substrate available on which the cells can adhere, they accumulate at the bottom of the drop and form a microtissue.
- Cultivation of cells in drops that are hanging at a surface is well known to the person of skill in the art. Form
DE 103 62 002 B4 , for example, the usual way of depositing drops of a cell suspension in a nutrient medium with a pipette on the inner surface of a Petri dish cover is known. The Petri dish cover then has to be inverted and placed on an appropriate Petri dish base plate. In the so closed Petri dish, the drops hang from the cover surface. The Petri dish often contains wet filter paper for providing the hanging drops with a humid atmosphere that prevents the hanging drops from drying. One of the most critical steps of this conventional hanging drop technique is inverting the plate to which the drops are attached; thus, this crucial step very often has to be carried out manually by an experienced scientist. - From
WO 03/078700 A1 - More recently (see e.g. Kelm et al. 2004 or Khademhosseini et al. 2006, PNAS Vol. 103, No. 8: 2480-2487), cell culturing in hanging drops has been called microscale tissue engineering using gravity-enforced cell assembly. Whereby Khademhosseini et al. seem to favor microscale tissue engineering using template-based cell assembly in polyethylene glycol (PEG) microwells; Kelm and Fussenegger apply the hanging drop technique in wells of a multiwell or Terasaki plate.
- All these documents report the necessity of inverting the substrate to which the drops adhere in order to correctly provide them as hanging drops. After being inverted, the substrates are reported to lay horizontal or to include an angle of at most 90° with the horizontal direction (see
WO 03/078700 A1 -
WO 2008/123741 A1 discloses a cell culture dish for embryoid body formation from embryonic stem cells in grooves at the lower ends of support rods attached to the bottom of a cover lid to be placed over a culture dish. The arrangement is intended for hanging drops which, however, have to be applied from below to the lower ends of the support rods. -
US 2003/0235519 A1 discloses a lid covering the wells in a microplate and intended for applying hanging drops to the bottom side of the lid. The arrangement allows loading the liquid from above via some kind of microfluidic channels incorporated in the lid. However, such channels are not precisely defined and thus do not allow accurate control of the liquid loading step. - Accordingly, it is a further object of the present invention to provide an improved hanging drop plate that allows highly reproducible and easy to handle loading of the drop liquid from above.
- These objects are achieved with a hanging drop plate according to the features of the
independent claim 1. This hanging drop plate as introduced at the beginning and according to the present invention is characterized in that the body further comprises at least one conduit that mouths into the at least one drop contact area from the direction of the first surface of the body the conduit comprising a culture compartment that is situated close to the second surface of the body and that comprises at least a part of the drop contact area. Additional inventive and preferred features derive from the dependent claims. - According to one embodiment of the hanging drop plate, the conduit partly penetrates the body in an essentially perpendicular direction in the region of the at least one drop contact area and partly extends essentially parallel to the second surface. In one embodiment, the conduit comprises an inlet connection that is situated at a side front of the body. In another embodiment, the conduit in addition penetrates the first surface of the body in an essentially perpendicular direction.
- According to a further embodiment of the hanging drop plate, the body comprises an upper part and a lower part that are attached to one another.
- In one embodiment, the drop contact area is selectively coated with a hydrophilic coating. In another embodiment, the drop contact area is selectively coated with biologically active compounds, which are selected from a group comprising polypeptides and polynucleotides.
- In a further embodiment, the surrounding area is selectively coated with a hydrophobic coating.
- In an advantageous embodiment, the hanging drop plate essentially has the shape of a standard microplate and the drop contact areas are arranged in an array, preferably of 4 x 6, of 8 x 12, or of 16 x 24 drop contact areas.
- According to one embodiment, a set for cultivating cells or for producing molecular aggregates comprises one hanging drop plate and two cover plates that are accomplished to be used as a bottom and/or top cover plate.
- According to a further embodiment, there is provided a method of cultivating cells wherein a number of cells or cellular micro-aggregates of at least one cell type are:
- moved through a conduit of the hanging drop plate into a liquid volume,
- cultivated within the liquid volume, and a microtissue is formed within the liquid volume from the cultivated cells.
- According to a further embodiment, there is provided a method of producing molecular aggregates wherein a number of molecules or molecular micro-aggregates are
- suspended in a liquid,
- moved through a conduit of the hanging drop plate together with a liquid volume,
- incubated within the liquid volume, and
a molecular aggregate is formed within the liquid volume from the incubated molecules or molecular micro-aggregates. - According to still another embodiment, there is provided a method of cultivating cells or of producing molecular aggregates wherein a part of the liquid in the liquid volume is withdrawn through the respective conduit of the hanging drop plate that is dedicated to the drop contact area.
- According to yet another embodiment, there is provided a method of cultivating cells or of producing molecular aggregates wherein at least a part of the withdrawn liquid is replaced by a liquid that is delivered through the respective conduit of the hanging drop plate that is dedicated to the drop contact area.
- The hanging drop plate according to the present invention is useful in the screening of drug system, in cell-based toxicity testing, and in mass production of cellular re-aggregates or protein crystals.
- Advantages of the hanging drop plate and hanging drop technique according to the present invention comprise:
- there is no scaffold required;
- it is applicable to small liquid volumes and cell numbers;
- it provides size control of the cell aggregates;
- it is adaptable to a wide variety of cell/tissue types such as hepatic microtissues (e.g. HepG2), myocardial spheroids, and microcartilage;
- it is capable to provide defined multi-cell type systems like for example an outer endothelial layer enveloping a core of fibroblasts;
- the required cell aggregates can be produced in short production times;
- a platform technology is provided that makes 3D cell culture technology as convenient as current 2D cell culture processes;
- the system comprises a HD-plate format that fits a multi-well plate with e.g. 96 or 384 wells;
- hanging drops are generated by top-loading using e.g. an automated multichannel pipetting robot;
- cell seeding and/or medium exchange can be carried out by an automated pipetter.
- The hanging drop plate of the present invention is now described in more detail on the basis of selected, exemplary embodiments that are depicted in schematic drawings, which shall illustrate preferred embodiments without delimiting the scope of the present invention. It is shown in:
- Fig. 1
- a front and top view as well as a 3D representation of a unit cell of a hanging drop plate with a conduit that exhibits a cylindrical/frustoconical shape, according to a first embodiment;
- Fig. 2
- a front and top view as well as a 3D representation a unit cell of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to a second embodiment;
- Fig. 3
- a front and top view of a linear array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment;
- Fig. 4
- a front, a side and a top view as well as a 3D representation of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment;
- Fig. 5
- a front and a side view of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment in combination with a top and bottom cover plate;
- Fig. 6
- a front, a side and a top view as well as a 3D representation of the cover plate of
Fig. 5 ; - Fig. 7
- a photographic image of a culture medium drop, hanging at the drop contact area of the hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment; the conduit being essentially filled with culture medium;
- Fig. 8
- a schematic cross section of the photographic image in
Figure 7 ; - Fig. 9
- alternative variants of the first and second embodiment of the hanging drop plate, wherein
- Fig. 9A
- shows two alternative relief structures that prevent spreading of the liquid volume on the second surface of the body;
- Fig. 9B
- shows two different surface treatments that prevent spreading of the liquid volume on the second surface of the body;
- Fig. 9C
- shows two alternative relief structures that additionally provide minimizing or maximizing the drop volume;
- Fig. 10
- schematic cross sections of hanging drop plates that have a body, which comprises an upper part and a lower part that are attached to one another, wherein
- Fig. 10A
- shows a variant with a side inlet to fix a liquid line to the conduit;
- Fig. 10B
- shows a variant with an open top inlet compartment that is fluidly connected to two or more conduits for supplying a 384 drop array with liquid dispensed from a 96 tip dispenser head;
- Fig. 11
- a microscopic image of neonatal rat cardiomyocytes as produced with a hanging drop plate according to
Fig. 7 ; - Fig. 12
- microscopic images of human hepatoma cells, wherein
- Fig. 12A
- shows 100 cells/drop, and
- Fig. 12B
- shows 250 cells/drop;
- Fig. 13
- microscopic images of rat pancreatic islet cells at different time points after seeding, wherein
- Fig. 13A
- shows the cells after 3 hours of incubation;
- Fig. 13B
- shows the cells after 24 hours of incubation; and
- Fig. 13C
- shows the microtissue after 96 hours of incubation.
-
Figure 1 shows a front and top view as well as a 3D representation of a unit cell of a hanging drop plate with a conduit that exhibits a cylindrical/frustoconical shape (comprising a first truncated cone, a cylinder, and a second truncated cone), according to a first embodiment. The hangingdrop plate 1 comprises abody 2 with afirst surface 3 and asecond surface 4 that is essentially coplanar to thefirst surface 3. Thesecond surface 4 comprises at least onedrop contact area 5 for adherently receiving a liquid volume 6 (seeFigs. 7 and 8 ) for cultivating cells or for producing molecular aggregates therein. The at least onedrop contact area 5 is distinguished from a surroundingarea 7 by arelief structure 8 that prevents spreading of theliquid volume 6 on thesecond surface 4 of thebody 2. Thebody 2 further comprises at least oneconduit 9 that mouths into the at least onedrop contact area 5 from the direction of thefirst surface 3 of thebody 2. - The
relief structure 8 in this case is accomplished as a circular rim and theconduit 9 penetrates theentire body 2 in an essentially perpendicular direction from thefirst surface 3 to thesecond surface 4. Theconduit 9 comprises aninlet compartment 12 that is situated close to thefirst surface 3 of thebody 2. Here, theinlet compartment 12 is accomplished as a widenedportion 13 of theconduit 9 inside of thebody 2, which is accomplished as one integral element. Theconduit 9 comprises aculture compartment 17 that is situated close to thesecond surface 3 of thebody 2 and that comprises at least a part of thedrop contact area 5. In this embodiment, theculture compartment 17 is accomplished as a funnel-shaped depression with straight walls. Theconduit 9 comprises acapillary portion 18 with a diameter of at least 10 µm, preferably between 10 µm and 500 µm, most preferably between 50 µm and 200 µm. Thecylindrical capillary portion 18 of theconduit 9 has a length between 0.1 mm and 30 mm, preferably between 0.5 mm and 2 mm. As can be seen from theFigure 1 , theconduit 9 is accomplished as an un-branched channel that essentially extends perpendicularly to the first andsecond surfaces conduit 9 are coaxially aligned. -
Figure 2 shows a front and top view as well as a 3D representation of a unit cell of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to a second embodiment. Most of what has been said about the first embodiment also applies here. In this embodiment however, theculture compartment 17 is accomplished as a funnel-shaped depression with curved walls. Theconduit 9 comprises acapillary portion 18 with a diameter of at least 10 µm, preferably between 10 µm and 500 µm, most preferably between 50 µm and 200 µm. Thecylindrical capillary portion 18 of theconduit 9 has a length of 0 mm here and theconduit 9 again is accomplished as an un-branched channel that essentially extends perpendicularly to the first andsecond surfaces conduit 9 being coaxially aligned. Deviating from the presentation inFigure 2 , the length of thecylindrical capillary portion 18 of theconduit 9 could be up to 30 mm as well. -
Figure 3 shows a front and top view of a linear array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment (seeFig. 2 ). The axes of the unit cells are spaced by a repetitiveaxial distance 23, which preferably is 18 mm, 9 mm, or 4.5 mm according to the axial distances of well known standard microplates with 24, 96, or 384 wells (see the published standard dimensions of microplates American National Standards Institute/Society for Biomolecular Sciences: ANSI/SBS 1-2004, ANSI/SBS 2-2004, ANSI/SBS 3-2004, ANSI/SBS 4-2004). -
Figure 4 shows two front views and a top view as well as a 3D representation of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment. Preferred dimensions are indicated and are very close to the dimensions of a standard microplate. Actually, a two dimensional array of 384drop contact areas 5 andconduits 9 is depicted here. The axial distances thus preferably are 4.5 mm in order to meet the ANSI/SBS standard and to be able to incorporate the array of 384drop contact areas 5 andconduits 9 in a hangingdrop plate 1 with the dimensions that are at least approximately the dimensions of a standard microplate. Whereas the unit cells of the hangingdrop plate 1 preferably are in close contact to each other (like also depicted inFig. 3 ), the array of these unit cells preferably is surrounded by ahorizontal plate 24. Thehorizontal plate 24 itself preferably is surrounded by avertical rim 25 that exhibits alower web 26 and anupper depression 27. Theweb 26 and thedepression 27 are of such dimensions that they serve as stacking means for tightly stacking the hangingdrop plates 1 and for safely holding the stacked plates in place. As can be seen from theFigure 4 , the height of theweb 26 and thedepression 27 preferably is about 2 mm in each case. - Departing from the presentation of
Figure 4 , the position of theweb 26 and thedepression 27 could be interchanged without losing their function as stacking means. Also the dimensions of thehorizontal plate 24 and thevertical rim 25 could be changed without departing from the spirit of the present invention. However, it is preferred in any case that thevertical rim 25 protrudes over thefirst surface 3 and below thesecond surface 4 of the hangingdrop plate 1. It is especially preferred (seeFigure 4 ) that thevertical rim 25 also protrudes below therelief structure 8 on thesecond surface 4 of the hangingdrop plate 1. Such a protrudingvertical rim 25 additionally secures the first andsecond surfaces drop plate 1 from being damaged or touched. Also the danger of contamination of these two surfaces is greatly reduced by thevertical rim 25. -
Figure 5 shows a front and a side view of a two dimensional array of unit cells of a hanging drop plate with a conduit that exhibits a hyperboloid shape, according to the second embodiment in combination with a top and bottom cover plate. As inFig. 4 , a two dimensional array of 384drop contact areas 5 andconduits 9 is depicted here. Again, the array of these unit cells preferably is surrounded by ahorizontal plate 24, which preferably is surrounded by avertical rim 25 that exhibits alower web 26 and anupper depression 27. Theweb 26 and thedepression 27 are of such dimensions that they serve as stacking means for tightly stacking the hangingdrop plates 1 and for safely holding the stacked plates in place. It is especially preferred that thecover plate 22 also exhibits alower web 26 and anupper depression 27 that correspond with those of the hangingdrop plate 1. Of particular preference is acover plate 22 that is accomplished to be used as a bottom and/or top cover plate as the case may be. This has the advantage that thesame cover plate 22 can be used as shell underneath the hangingdrop plate 1 or as a cap on top of it. - Especially during cultivation or incubation in the process of cultivating cells or of producing molecular aggregates in at least one
liquid volume 6 that adheres to adrop contact area 5 of a hangingdrop plate 1, it is preferred to cover the hangingdrop plate 1 on the top and bottom side in order to avoid unacceptable evaporation of the liquid in theliquid volume 6 or in theconduit 9. Preferably at the bottom of a first hangingdrop plate 1, acover plate 22 is placed as a bottom shell plate. This first hangingdrop plate 1 can be covered by asecond cover plate 22 that is now used as a cap. Such a "sandwich" of twocover plates 22 and one hangingdrop plate 1 between them is the smallest unit preferably formed for storage, cultivation or incubation, and safe transport of a hanging drop plate, whether it is loaded with liquid volumes and cells and/or molecules or not (seeFig. 5 ). - For incubation or cultivation in device with a temperature control, several hanging
drop plates 1 can directly be stacked on top of each other and only covered on the top and the bottom of the uppermost and lowermost hangingdrop plate 1 with acover plate 22. This is especially preferred when all hanging drop plates of a stack are loaded with the same samples so that no cross contamination is to be feared at all. If however different samples are loaded (within the same or differenthanging drop plates 1 of a stack), it is preferred to separate the hangingdrop plates 1 with an intermediately placedcover plate 22 between each of the hangingdrop plates 1. - Of course it is possible to produce individual hanging drop plates 1 (see
Fig. 4 ) and separate cover plates 22 (seeFig. 6 ); it is just preferred to have the same dimensions of thelower web 26 and anupper depression 27 in each case. However, the most preferred set for cultivating cells or for producing molecular aggregates preferably comprises one hangingdrop plate 1 and twocover plates 22. -
Figure 7 shows a photographic image of a culture medium drop, hanging at thedrop contact area 5 of the hangingdrop plate 1 with aconduit 9 that exhibits a hyperboloid shape, according to the second embodiment. It is evident that theconduit 9 essentially is filled with culture medium. This holding the drop (i.e. the liquid volume 6) at thedrop contact area 5 is due to a combined action of different elements: - a) The capillary force of the
conduit 9 is working against the gravity and the hydrostatic force in theconduit 9 and theliquid volume 6 that attract the drop. - b) An eventually present selective hydrophilic coating in the
drop contact area 5 supports the adhesion of theliquid volume 6 and works against the hydrostatic force and the gravity. - c) The relief structure 8 (accomplished as a rim here) stabilizes the
liquid volume 6 and supports the definition of the actual content of the liquid volume. - d) The surface tension of the drop additionally stabilizes the
liquid volume 6. - e) A selective
hydrophobic coating 21 applied to the surroundingarea 7 of the hangingdrop plate 1 additionally may stabilize theliquid volume 6. - Actually, the image has been taken from a prototype of a linear array of unit cells of a hanging
drop plate 1 with aconduit 9 that exhibits a hyperboloid shape, according to a second embodiment (seeFigures 2 and 3 ). In order to place the prototype in a Petri dish that was used as a bottom shell, the prototype had been equipped with ahorizontal plate 24, avertical rim 25, and astand plate 28 that all surround the unit cells of the hangingdrop plate 1. Thus, between the unit cells, thehorizontal plate 24 and thevertical rim 25 of the prototype hangingdrop plate 1 and the Petri dish below (not visible here), a practically closed space was formed, which allowed a saturated humid atmosphere to be kept around theliquid volumes 6 situated at the respectivedrop contact areas 5. - To support understanding the image, the
Figure 8 shows a schematic cross section of the photographic image inFigure 7 . As in all Figures, the same reference numbers direct to the same or similar features, even if they are not discussed in detail in each case. -
Figure 9 shows alternative variants of the first and second embodiment of the hanging drop plate. The layout of the hangingdrop plate 1 is according to the prototype shown in theFigures 7 and 8 . However, also single unit cells or entire hangingdrop plates 1 with the approximate shape and dimension of a standard microplate could also show unit cells according to the variants shown here. -
Figure 9A shows twoalternative relief structures 8 that prevent spreading of theliquid volume 6 on thesecond surface 4 of thebody 2 of the hangingdrop plate 1 according to the invention. The relief structure 8 (instead of being a rim) may be accomplished as ring-like depression (see left side) or as ring-like elevation (see right side). In any case, an abrupt change of direction in the profile of therelief structure 8 is safely defining the border of theliquid volume 6 or the drop. -
Figure 9B shows two different surface treatments that prevent spreading of theliquid volume 6 on thesecond surface 4 of thebody 2 of the hangingdrop plate 1 according to the invention. On the left side, thedrop contact area 5 is selectively coated with biologically active compounds, which are selected from a group comprising polypeptides (antibodies, growth factors, enzymes) and polynucleotides (RNA, DNA single or double strands). On the right side the surroundingarea 7 is selectively coated with ahydrophobic coating 21. A combination of these two treatments is especially preferred as well. The utilization of ahydrophobic coating 21 may even dispense with the necessity to incorporate a relief structure in the form of an additional rim or depression at thesecond surface 4. Thus, theedge 29 shown here is sufficient as arelief structure 8. -
Figure 9C shows two alternative relief structures that additionally provide minimizing or maximizing the drop volume. On the left side, a depression with anedge 29 is formed. Here, the drop volume is maximized. On the right side, an elevation with anedge 29 is formed; thus, minimizing the drop volume. In addition, a hangingdrop plate 1 is shown here, theconduit 9 of which comprises aninlet compartment 12 that is situated close to thefirst surface 3 of thebody 2. Preferably, theinlet compartment 12 is accomplished as a widenedportion 13 of theconduit 9 inside of the body 2 (see e.g.Figs. 9A and 9B ) or as acup 14 on thefirst surface 3 of thebody 2 as depicted here. A combination of such a widenedportion 13 and acup 14 is also feasible (not shown). - It is important to note here that any combination of the features shown in the Figures and/or described in the specification can be utilized and is comprised by the spirit of the present invention.
-
Figure 10 shows schematic cross sections of hangingdrop plates 1 that have abody 2, which comprises anupper part 15 and alower part 16 that are attached to one another. This two-part arrangement greatly facilitates the production of an alternativehanging drop plate 1 with aconduit 9 that partly penetrates thebody 2 in an essentially perpendicular direction in the region of the at least onedrop contact area 5 and that partly extends essentially parallel to thesecond surface 4 of the hangingdrop plate 1. -
Figure 10A shows a variant with a side inlet to fix a liquid line to the conduit. Here, theconduit 9 comprises aninlet connection 10 that is situated at aside front 11 of thebody 2. Different to the embodiments shown in theFigs. 1 to 8 , where the liquids preferably are delivered to theconduits 9 of the hangingdrop plate 1 with one or more pipettes or with a pipetting robot, lines 30 can directly be connected to a hangingdrop plate 1. Throughsuch lines 30, liquids as well as cells or molecules can be delivered at any time to theliquid volumes 6 of a hangingdrop plate 1. Thus, exchange of liquids, such as buffers or washing liquids in theliquid volumes 6 is facilitated. -
Figure 10B shows a variant with an open top inlet compartment that is fluidly connected to two or more conduits for supplying a 384 drop array with liquid dispensed from a 96 tip dispenser head. Here, theconduit 9 in addition penetrates thefirst surface 3 of thebody 2 in an essentially perpendicular direction and theconduit 9 is accomplished as a branched channel comprisingchannel parts 19 that essentially extend perpendicularly to the first andsecond surfaces branch parts 20 that essentially extend parallel to thesecond surface 4. Whereas thedrop contact areas 5 can be spaced apart by anaxial distance 23 of 4.5 mm, the open top inlet compartments 12 then preferably are spaced apart by 9 mm or the doubleaxial distance 23. In a linear array hanging drop plate 1 (compare toFig. 3 ), twobranch parts 20 join acommon channel part 19. In a 2D-array hanging drop plate 1 (compare toFig. 4 ), fourbranch parts 20 join acommon channel part 19. Thus, with a robot that comprises a 96 tip dispenser head a hangingdrop plate 1 with a 384 drop array can be supplied with liquid and/or cells or molecules at once. - Complementary control of the drop shape and position can be obtained by selective coating of the inside surface of the
culture compartment 17, theridge 8 and the surroundingplate 7 to achieve hydrophilic and hydrophobic areas. Also, the inside surfaces of bothcompartments conduit 9 can be coated with a surface film that prevents cells from adhering to the surface. Alternatively the surface can be patterned directly using micro- and nano-machining techniques to prevent adhesion. - The hanging
drop plates 1 are preferably tissue culture plates of standard outer dimensions (ANSI/SBS 1-2004) compatible with high throughput systems. As shown, the hangingdrop plate 1 set preferably consists of two elements: - a) a hanging
drop plate 1 containing the hanging drop wells or dropcontact areas 5; and - b) a
cover 22 supporting the hangingdrop plate 1. - Both elements (hanging
drop plate 1 and cover 22) are made out of or at least comprise at their respective surfaces a biocompatible plastic material (e.g. Polycarbonate, Polyethylene, Polystyrene, or Polypropylene). Both elements (hangingdrop plate 1, cover 22) are compatible with photometric readers (reading from the top and bottom, preferably bottom reading). The hangingdrop plate 1 contains preferably 96 or 384 units of the hanging drop wells. The hangingdrop plate 1 preferably is equipped with avertical rim 25 for cover-independent robotic handling. Thecover 22 provides enough space for drop formation within each single unit of the hangingdrop plate 1. Hangingdrop plates 1 are designed to be stacked onto each other.Covers 22 can be equipped with a narrow channel system or trough along the inner side of the base allowing to be filled with water/saline in order to minimize drop evaporation.Covers 22 can be used for both, lower and upper shells of hangingdrop plates 1 to minimize evaporation and protect from contaminations. - Hanging drops can be generated by top loading of liquids into the
inlet compartment 12 by standard single channel or multichannel pipettes, in a manual or automated fashion. The design of the hanging drop well allows repeated liquid exchange through theinlet compartment 12. - The present invention provides a device for coaxing and culturing of cells into the third dimension without artificial substrate-cell interactions. The device comprises a microfluidic system with two compartments (
inlet compartment 12 and culture compartment 17). The volume of theinlet compartment 12 is preferably between 5 µl and 50 µl, most preferably between 10 µl and 30 µl. The volume of theculture compartment 17 is preferably between 10 µl and 100 µl, most preferably between 10 µl and 50 µl. The shapes ofinlet compartment 12 andculture compartment 17 can be cylindrical, conical or hyperbolical. Each culture volume of a single unit preferably connects to aring 8 which protrudes from the culture compartment bottom to stabilize and separate individual drops. The height of the drop separator ring orrelief structure 8 in the form of a ridge is preferably between 0.1 mm and 5 mm, most preferably between 1 and 2 mm. - The hanging
drop plate 1 according to the invention can be made directly by injection molding or laterally by replica molding. Alternative production methods comprise micromilling techniques and/or gluing or welding parts of the hangingdrop plate 1 together. - In the following, the materials and methods as well as the achieved results when using the prototype of the hanging
drop plate 1 according to the present invention shall be briefly described. - A typical protocol for the production of a hanging drop culture is as follows:
- a) Harvest cells from conventional 2D-culture by standard trypsinization.
- b) Wash cells with regular cell culture medium.
- c) Take up cells in an appropriate volume of regular cell culture medium with a density of 3'333 to 333'333 cells/ml corresponding to 100 to 10'000 cells/30 µl drop or
liquid volume 6 respectively depending on experimental requirements. - d) Gently swirl the flask containing the cells and dispense drops of 30 µl of cell suspension into the inlet compartments 12 of the hanging
drop plate 1 by top loading. - e) Place the hanging
drop plate 1 into a humidified box in a regular cell culture incubator. - f) Cells will aggregate and form microtissues within 1-3 days, depending on the type of cells.
- g) Long term incubations or experimental protocols will eventually require a change of medium. This is performed by simply aspirating up to 25 µl of old medium from the inlet compartments 12 on the top side of the hanging
drop plate 1 and by replacing by a similar volume of fresh medium that is pipetted into the inlet compartments 12. - h) Harvest microtissues by rinsing the
drop contact areas 5 with 50 to 100 µl of medium delivered to the inlet compartments 12 on the top side of the hangingdrop plate 1 and by thus rinsing the microtissues into a collection device (i.e. a Petri dish or a microplate with 96 or 384 wells). - Freshly isolated cardiomyocytes from neonatal rats were produced according to the above protocol not including cell harvesting from 2D cultures (point a from the protocol). The resulting microtissues produced from 10'000 cells/drop correspond to a microtissue size of about 250 µm in diameter. This is demonstrated in
Figure 11 that shows a microscopic image of rat cardiomyoyte-composed microtissues produced with a hanging drop plate according toFig. 7 . - Human hepatoma cells (HepG2) were treated according to the above protocol.
Figure 12 shows microscopic images of human hepatoma microtissues 48 hours after seeding with 100 cells per drop (Fig. 12A ) and 250 cells per drop (Fig. 12B ). These cell densities resulted in microtissues of 100 µm and 200 µm in diameter respectively. - Rat pancreatic islet cells (250 cells per drop) were treated according to the above protocol as it is demonstrated in the
Figure 13 that shows microscopic images of rat pancreatic islet cells at different time points after seeding. The formation of the rat pancreatic islet microtissue can be followed: After 3 hours of incubation, practically only single cells are present (seeFig. 13A ). After 24 hours of incubation, practically all cells have aggregated (seeFig. 13B ). After 96 hours of incubation, a spherical rat pancreatic islet microtissue with a diameter of approximately 100 µm has been formed (seeFig. 13C ). - Thus, the present invention comprises a method of cultivating cells or of producing molecular aggregates in at least one
liquid volume 6 that adheres to adrop contact area 5 of a hangingdrop plate 1 as described on the base of theFigures 1 to 10 . The hangingdrop plate 1 comprises abody 2 with afirst surface 3 and asecond surface 4 that is essentially coplanar to thefirst surface 3 and that comprises at least onedrop contact area 5 for adherently receiving the at least oneliquid volume 6 therein. The at least onedrop contact area 5 is distinguished from a surroundingarea 7 by arelief structure 8 that prevents spreading of theliquid volume 6 on thesecond surface 4 of thebody 2. The method according to the present invention is characterized in that aliquid volume 6 is applied to adrop contact area 5 through aconduit 9 that mouths into thedrop contact area 5 from the direction of thefirst surface 3 of thebody 2. - When carrying out the method of cultivating cells, preferably, a number of cells or cellular micro-aggregates of at least one cell type are
- suspended in a liquid,
- moved trough a
conduit 9 of the hangingdrop plate 1 together with aliquid volume 6, - cultivated within the
liquid volume 6; and - Alternatively when carrying out the method of cultivating cells, a number of cells or cellular micro-aggregates of at least one cell type are
- moved trough a
conduit 9 of the hangingdrop plate 1 into aliquid volume 6, - cultivated within the
liquid volume 6; and - When carrying out the method of producing molecular aggregates, preferably, a number of molecules or molecular micro-aggregates are
- suspended in a liquid,
- moved trough a
conduit 9 of the hangingdrop plate 1 together with aliquid volume 6, - incubated within the
liquid volume 6; and - Preferably when carrying out the method of cultivating cells or of producing molecular aggregates, a part of the liquid in the
liquid volume 6 is withdrawn through therespective conduit 9 of the hangingdrop plate 1 that is dedicated to thedrop contact area 5. In the following, it is preferred to replace at least a part of the withdrawn liquid by a liquid that is delivered through therespective conduit 9 of the hangingdrop plate 1 that is dedicated to thedrop contact area 5. - Of particular interest is the use of the of the hanging
drop plate 1 according to the invention in: - a) Drug screening and development: The hanging drop plate provides a platform for manual (low volume) or automated (high volume) generation of biomimetic 3D cellular aggregates, i.e. microtissues, with improved tissue specific function. Full compatibility to robotic liquid handlings systems will enable high throughput compound screening for lead identification and lead optimization subsequent to the re-aggregation process without the requirement of further cell passaging. Microtissue based assays can be performed in a regular manner as with conventional 2D cell based assays with end-point determination by either microscopic, photometric, fluorometric, and/or luminometric measurements (bottom reading) and/or further downstream tissue processing (histological analysis).
- b) Cell-based toxicity testing (ADME/tox): The hanging drop plate provides a platform for manual or automated generation of 3D cellular aggregates, i.e. microtissues, with improved tissue specific function. Full compatibility to robotic liquid handlings systems will enable high throughput testing of potential drug candidates involving the aspects of adsorption, metabolism, excretion and toxicology. Microtissue based assays can be performed in a regular manner as with conventional 2D cell based assays with end-point determination by either microscopic, photometric, fluorometric, and/or luminometric measurements (bottom reading) and/or further downstream tissue processing (histological analysis).
- c) Cell-based therapy: Microtissues display several advantages for cell-based therapies compared to single cell treatment comprising (i) higher functionality, (ii) preformed extracellular matrix, (iii) secretion of proangiogenic factors such as vascular endothelial growth factor and lower motility as single cells. Therefore microtissues have a higher potential for tissue regeneration/repair to treat various organic disorders such as myocardial infarct or diabetes. Mass production is an indispensable prerequisite for their use in cell based therapies. The hanging drop plate provides mass production compatibility by following features as outline previously:
- 1. requires low culture volume
- 2. simultaneous top loading or withdrawal by dispenser with up to 384-channels
- 3. inlet compartment fluidly connected to two or more conduits, serving two or more drops per dispenser channel
- 4. stackability of hanging drop plates
- d) Protein crystallization: To investigate protein function, understanding the 3-dimensional structure is mandatory. Protein crystals are generated by slowly increasing the protein concentration in hanging drops of specific liquids by evaporation processes. The hanging drop plate enables robotic compatible seeding, raising and harvesting of protein/molecular crystals.
-
- 1
- hanging drop plate
- 2
- body
- 3
- first surface
- 4
- second surface
- 5
- drop contact area
- 6
- liquid volume
- 7
- surrounding area
- 8
- relief structure
- 9
- conduit
- 10
- inlet connection
- 11
- side front of 2
- 12
- inlet compartment
- 13
- widened portion
- 14
- cup
- 15
- upper part of 2
- 16
- lower part of 2
- 17
- culture compartment
- 18
- capillary portion
- 19
- channel parts
- 20
- branch parts
- 21
- hydrophobic coating
- 22
- cover plate
- 23
- axial distance
- 24
- horizontal plate
- 25
- vertical rim
- 26
- lower web
- 27
- upper depression
- 28
- stand plate
- 29
- edge
- 30
- line
Claims (20)
- Hanging drop plate (1), which comprises a body (2) with a first surface (3) and a second surface (4) that is essentially coplanar to the first surface (3) and that comprises at least one drop contact area (5) for adherently receiving a liquid volume (6) for cultivating cells or for producing molecular aggregates therein, the at least one drop contact area (5) being distinguished from a surrounding area (7) by a relief structure (8) or a selective hydrophobic coating (21) that prevents spreading of the liquid volume (6) on the second surface (4) of the body (2), characterized in that the body (2) further comprises at least one conduit (9) that mouths into the at least one drop contact area (5) from the direction of the first surface (3) of the body (2), the conduit (9) comprising a culture compartment (13) that is situated close to the second surface (3) of the body (2) and that comprises at least a part of the drop contact area (5).
- Hanging drop plate (1) according to claim 1, characterized in that the culture compartment (17) has a shape selected from the group consisting of cylindrical, conical and hyperbolical.
- Hanging drop plate (1) according to claim 1, characterized in that the culture compartment (17) is a funnel-shaped depression with straight or curved walls, the conduit (9) comprising an inlet compartment (12) that is situated close to the first surface (3) of the body (2), the inlet compartment (12) being accomplished as a widened portion (13) of the conduit (9) inside of the body (2), as a cup (14) on the first surface (3) of the body (2), or as a combination of such a widened portion (13) and a cup (14).
- Hanging drop plate (1) according to one of claims 1 to 3, characterized in that the culture compartment (17) has a volume between 10 and 100 µl, preferably between 10 and 50 µl.
- Hanging drop plate (1) according to one of the preceding claims, characterized in that the conduit (9) has a cylindrical/frustoconical or hyperbolic shape.
- Hanging drop plate (1) according to claim 5, characterized in that the conduit (9) comprises a capillary portion (18) with a diameter between 10 µm and 500 µm, preferably between 50 µm and 200 µm.
- Hanging drop plate (1) according to claim 6, characterized in that the cylindrical or hyperbolic capillary portion (18) of the conduit (9) has a length between 0.1 mm and 30 mm, preferably between 0.5 mm and 2 mm.
- Hanging drop plate (1) according to one of the preceding claims, characterized in having a relief structure (8) that is selected from a group that comprises a rim, a bulge, a depression, an elevation, and any combination thereof and is located in or on the second surface (4).
- Hanging drop plate (1) according to one of the preceding claims, characterized in that the conduit (9) penetrates the entire body (2) in an essentially perpendicular direction from the first surface (3) to the second surface (4).
- Hanging drop plate (1) according to one of the preceding claims, characterized in that the conduit (9) is accomplished as an un-branched channel that essentially extends perpendicularly to the first and second surfaces (3,4), wherein all portions of the conduit (9) are coaxially aligned.
- Hanging drop plate (1) according to one of the claims 1 to 9, characterized in that the conduit (9) is accomplished as a branched channel comprising channel parts (19) that essentially extend perpendicularly to the first and second surfaces (3,4) and branch parts (20) that essentially extend parallel to the second surface (4).
- Hanging drop plate (1) according to one of the preceding claims, characterized in that the drop contact area (5) is selectively coated with a hydrophilic coating.
- Hanging drop plate (1) according to one of the claims 1 to 11, characterized in that the drop contact area (5) is selectively coated with biologically active compounds, which are selected from a group comprising polypeptides and polynucleotides.
- Hanging drop plate (1) according to any one of the preceding claims, characterized in that it at least essentially has the shape of a standard microplate and in that the drop contact areas (5) are arranged in an array, preferably of 4 x 6, of 8 x 12, or of 16 x 24 drop contact areas (5).
- Method of cultivating cells or of producing molecular aggregates in at least one liquid volume (6) that adheres to a drop contact area (5) of a hanging drop plate (1) according to claim 1, characterized in that a liquid volume (6) is applied to a drop contact area (5) through a conduit (9) that mouths into the drop contact area (5) from the direction of the first surface (3) of the body (2).
- Method of cultivating cells according to claim 15, characterized in that a number of cells or cellular micro-aggregates of at least one cell type are- suspended in a liquid,- moved trough a conduit (9) of the hanging drop plate (1) together with a liquid volume (6),- cultivated within the liquid volume (6); anda microtissue is formed within the liquid volume (6) from the cultivated cells.
- Method of cultivating cells according to claim 15, characterized in that a number of cells or cellular micro-aggregates of at least one cell type are- moved trough a conduit (9) of the hanging drop plate (1) into a liquid volume (6),- cultivated within the liquid volume (6); anda microtissue is formed within the liquid volume (6) from the cultivated cells.
- Method of cultivating cells or of producing molecular aggregates according to any one of the claims 15 to 17, characterized in that a part of the liquid in the liquid volume (6) is withdrawn through the respective conduit (9) of the hanging drop plate (1) that is dedicated to the drop contact area (5).
- Method of cultivating cells or of producing molecular aggregates according to the claim 18, characterized in that at least a part of the withdrawn liquid is replaced by a liquid that is delivered through the respective conduit (9) of the hanging drop plate (1) that is dedicated to the drop contact area (5).
- Use of the of the hanging drop plate (1) according to any one of the claims 1 to 14 in the screening of drug systems or in cell based toxicity testing or in mass production of cellular re-aggregates or protein crystals.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
PCT/CH2008/000391 WO2010031194A1 (en) | 2008-09-22 | 2008-09-22 | Hanging drop plate |
Publications (2)
Publication Number | Publication Date |
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EP2342317A1 EP2342317A1 (en) | 2011-07-13 |
EP2342317B1 true EP2342317B1 (en) | 2012-12-19 |
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Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
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EP08800437A Active EP2342317B1 (en) | 2008-09-22 | 2008-09-22 | Hanging drop plate |
Country Status (8)
Country | Link |
---|---|
US (1) | US9126199B2 (en) |
EP (1) | EP2342317B1 (en) |
JP (1) | JP5490803B2 (en) |
CN (1) | CN102257123B (en) |
CA (1) | CA2737627C (en) |
DK (1) | DK2342317T3 (en) |
ES (1) | ES2401640T3 (en) |
WO (1) | WO2010031194A1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2014202199A1 (en) * | 2013-06-17 | 2014-12-24 | Baer Hans U | Matrix and implant for tissue engineering |
DE102015003019A1 (en) | 2015-03-06 | 2016-09-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the optical detection of movement in a biological sample with spatial extent |
EP3702755A1 (en) | 2015-10-26 | 2020-09-02 | FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. | Detector for detecting optical radiation |
Families Citing this family (38)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US8980631B2 (en) * | 2009-06-30 | 2015-03-17 | University Of Virginia Patent Foundation | High-throughput culture and transfer device and method |
EP2529238A4 (en) * | 2010-01-28 | 2014-10-08 | The Regents Of The University Of Michigan | Hanging drop devices, systems and/or methods |
US8895048B2 (en) | 2010-04-06 | 2014-11-25 | The University Of Kansas | Templated islet cells and small islet cell clusters for diabetes treatment |
US9267103B2 (en) | 2010-07-27 | 2016-02-23 | Insphero Ag | Compliant multi-well plate |
CN103429729B (en) * | 2011-03-03 | 2015-01-21 | 弗·哈夫曼-拉罗切有限公司 | Hanging droplet plate |
WO2013049165A1 (en) * | 2011-09-30 | 2013-04-04 | National Health Research Institutes | Microfluidic hanging drop chip |
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US9790465B2 (en) | 2013-04-30 | 2017-10-17 | Corning Incorporated | Spheroid cell culture well article and methods thereof |
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DE102013011534B4 (en) | 2013-07-10 | 2015-09-03 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Culture vessel and method for culturing biological cells in hanging drops |
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US9568404B2 (en) * | 2014-05-16 | 2017-02-14 | Junyu Mai | Method and apparatus for biomolecule analysis |
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SG11201703493SA (en) | 2014-10-29 | 2017-05-30 | Corning Inc | Cell culture insert |
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PL238379B1 (en) | 2016-06-10 | 2021-08-16 | Univ Jagiellonski | Method for producing a building substrate, device for perfusion cell cultures, method for carrying out the cell cultures and the set of equipment |
US11629319B2 (en) | 2016-06-15 | 2023-04-18 | Mimetas, B.V. | Cell culture device and methods |
PT3606467T (en) | 2017-04-06 | 2023-09-14 | Univ Minnesota | Prosthetic valves and methods of making |
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US11857970B2 (en) | 2017-07-14 | 2024-01-02 | Corning Incorporated | Cell culture vessel |
WO2019014610A1 (en) | 2017-07-14 | 2019-01-17 | Corning Incorporated | Cell culture vessel for 3d culture and methods of culturing 3d cells |
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JP2019086375A (en) | 2017-11-07 | 2019-06-06 | オリンパス株式会社 | Method and kit for preparing microscopic observation samples |
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JP2019106962A (en) | 2017-12-20 | 2019-07-04 | オリンパス株式会社 | Sample processing method and sample culture method |
JP7171695B2 (en) | 2018-07-13 | 2022-11-15 | コーニング インコーポレイテッド | A microcavity dish having sidewalls containing a liquid medium delivery surface |
WO2020013845A1 (en) | 2018-07-13 | 2020-01-16 | Corning Incorporated | Cell culture vessels with stabilizer devices |
CN111065725B (en) | 2018-07-13 | 2024-03-29 | 康宁股份有限公司 | Fluidic device comprising microplates with interconnected walls |
US11845084B2 (en) | 2020-05-04 | 2023-12-19 | The Board Of Trustees Of The University Of Illinois | Microchip high density hanging drop three-dimension culture platform |
WO2021261622A1 (en) * | 2020-06-25 | 2021-12-30 | 주식회사 넥스트앤바이오 | Standard organoid production method |
TWI760120B (en) * | 2021-02-25 | 2022-04-01 | 國立清華大學 | Hanging drop device, formation method of hanging drop and cell culture method by using hanging drop |
CN113046244B (en) * | 2021-03-30 | 2023-01-06 | 上海睿钰生物科技有限公司 | Culture device and culture method using same |
CN113355238A (en) * | 2021-06-10 | 2021-09-07 | 上海睿钰生物科技有限公司 | Culture device and culture method based on culture device |
NL2028424B1 (en) | 2021-06-10 | 2022-12-20 | Mimetas B V | Method and apparatus for forming a microfluidic gel structure |
Family Cites Families (14)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4912057A (en) * | 1989-06-13 | 1990-03-27 | Cancer Diagnostics, Inc. | Cell chamber for chemotaxis assay |
US5334352A (en) * | 1992-09-23 | 1994-08-02 | Icn Biomedicals, Inc. | Manifold construction |
US6090251A (en) * | 1997-06-06 | 2000-07-18 | Caliper Technologies, Inc. | Microfabricated structures for facilitating fluid introduction into microfluidic devices |
US5882930A (en) * | 1997-11-10 | 1999-03-16 | Hyseq, Inc. | Reagent transfer device |
DE10210908A1 (en) | 2002-03-05 | 2003-12-04 | Alfred Nordheim | Device for applying liquid media and method therefor |
US20030235519A1 (en) | 2002-06-24 | 2003-12-25 | Corning Incorporated | Protein crystallography hanging drop lid that individually covers each of the wells in a microplate |
US7112241B2 (en) * | 2002-12-31 | 2006-09-26 | Corning Incorporated | Protein crystallography hanging drop multiwell plate |
AU2005222618A1 (en) | 2004-03-12 | 2005-09-29 | Biotrove, Inc. | Nanoliter array loading |
JP4918755B2 (en) * | 2005-05-30 | 2012-04-18 | 株式会社日立製作所 | Cell culture container, method for producing cell culture container, and cultured cell |
US7556776B2 (en) * | 2005-09-08 | 2009-07-07 | President And Fellows Of Harvard College | Microfluidic manipulation of fluids and reactions |
WO2007087402A2 (en) * | 2006-01-24 | 2007-08-02 | Brown University | Cell aggregation and encapsulation device and method |
KR20080091832A (en) * | 2006-01-30 | 2008-10-14 | 유니버시티 오브 버지니아 페이턴트 파운데이션 | Methods of preparing and characterizing mesenchymal stem cell aggregates and uses thereof |
KR100836827B1 (en) | 2007-04-09 | 2008-06-10 | 전남대학교산학협력단 | Cell culture dish for the embryoid body formation from embryonic stem cells |
WO2013049165A1 (en) * | 2011-09-30 | 2013-04-04 | National Health Research Institutes | Microfluidic hanging drop chip |
-
2008
- 2008-09-22 ES ES08800437T patent/ES2401640T3/en active Active
- 2008-09-22 DK DK08800437.9T patent/DK2342317T3/en active
- 2008-09-22 CA CA2737627A patent/CA2737627C/en active Active
- 2008-09-22 WO PCT/CH2008/000391 patent/WO2010031194A1/en active Application Filing
- 2008-09-22 CN CN200880132067.3A patent/CN102257123B/en active Active
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- 2008-09-22 JP JP2011527171A patent/JP5490803B2/en active Active
- 2008-09-22 US US13/120,215 patent/US9126199B2/en active Active
Cited By (5)
Publication number | Priority date | Publication date | Assignee | Title |
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WO2014202199A1 (en) * | 2013-06-17 | 2014-12-24 | Baer Hans U | Matrix and implant for tissue engineering |
DE102015003019A1 (en) | 2015-03-06 | 2016-09-08 | Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. | Method and device for the optical detection of movement in a biological sample with spatial extent |
US10488400B2 (en) | 2015-03-06 | 2019-11-26 | Fraunhofer-Gesellschaft Zur Foerderung Der Angewandten Forschung E. V. | Method and device for optical detection of a movement in a biological sample with a spatial extent |
EP4242637A2 (en) | 2015-03-06 | 2023-09-13 | Universität des Saarlandes | Method for optical detection of a movement in a biological sample with a spatial extent |
EP3702755A1 (en) | 2015-10-26 | 2020-09-02 | FRAUNHOFER-GESELLSCHAFT zur Förderung der angewandten Forschung e.V. | Detector for detecting optical radiation |
Also Published As
Publication number | Publication date |
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JP2012502636A (en) | 2012-02-02 |
ES2401640T3 (en) | 2013-04-23 |
CN102257123B (en) | 2014-03-26 |
US20110306122A1 (en) | 2011-12-15 |
WO2010031194A1 (en) | 2010-03-25 |
US9126199B2 (en) | 2015-09-08 |
EP2342317A1 (en) | 2011-07-13 |
CN102257123A (en) | 2011-11-23 |
DK2342317T3 (en) | 2013-03-18 |
CA2737627C (en) | 2018-10-16 |
JP5490803B2 (en) | 2014-05-14 |
CA2737627A1 (en) | 2010-03-25 |
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